Blar i Brage IMR på forfatter "Johnsen, Ingrid A."
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Dispersion of salmon lice in the Hardangerfjord
Asplin, Lars; Johnsen, Ingrid A.; Sandvik, Anne Dagrun; Albretsen, Jon; Sundfjord, Vibeke; Aure, Jan; Boxaspen, Karin (Journal article; Peer reviewed, 2013-10-15)The abundance of salmon lice in the Hardangerfjord is potentially large enough to be a threat to the wild fish stocks of the fjord. The salmon louse spends a period of 2–4 weeks in its planktonic stages drifting in the ... -
The hydrodynamic foundation for salmon lice dispersion modeling along the Norwegian coast
Asplin, Lars; Albretsen, Jon; Johnsen, Ingrid A.; Sandvik, Anne Dagrun (Peer reviewed; Journal article, 2020)Norway has complicated dynamics in the coastal ocean and in the fjords. In this area is also the largest salmon aquaculture industry in the world. The salmon industry is valuable for Norwegian economy worth more than 60 ... -
Impact of variable physical conditions and future increased aquaculture production on lice infestation pressure and its sustainability in Norway
Myksvoll, Mari Skuggedal; Sandvik, Anne Dagrun; Johnsen, Ingrid A.; Skardhamar, Jofrid; Albretsen, Jon (Peer reviewed; Journal article, 2020)Salmon lice infestation is a challenge for wild post-smolt salmon during migration from their natal river to the sea in several regions of Norway. The traffic-light management system regulates growth in the aquaculture ... -
Optimal estimation of lice release from aquaculture based on ambient temperatures
Johnsen, Ingrid A.; Stien, Lars Helge; Sandvik, Anne Dagrun; Asplin, Lars; Oppedal, Frode (Peer reviewed; Journal article, 2020)Models for mapping and forecasting infective pressure from salmon louse Lepeophtheirus salmonis larvae are of major importance in the Norwegian government’s management of salmonid aquaculture. These models use site-reported ... -
Quantification of eDNA to map the distribution of cold-water coral reefs
Kutti, Tina; Johnsen, Ingrid A.; Skaar, Katrine Sandnes; Ray, Jessica Louise; Husa, Vivian; Dahlgren, Thomas Gunnar (Peer reviewed; Journal article, 2020)An effective management of vulnerable marine ecosystems is dependent on thorough knowledge of their location. Multibeam bathymetric mapping and targeted remotely operated vehicle (ROV) surveys are currently used to map ... -
Vertical salmon lice behaviour as a response to environmental conditions and its influence on regional dispersion in a fjord system
Johnsen, Ingrid A.; Fiksen, Øyvind; Sandvik, Anne Dagrun; Asplin, Lars (Journal article; Peer reviewed, 2014-06-04)The salmon louse Lepeophtheirus salmonis is a major parasite of salmon, and is able to travel between farms during its pelagic phases. We investigated the spatial dispersion of L. salmonis planktonic stages in the ...